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Ice-Accretion Scaling Using Water-Film Thickness Parameters (June 1, 2003)

Author: Anderson, David N.; Feo, Alejandr
Subject: COMPUTERIZED SIMULATION; THREE DIMENSIONAL MODELS; TURBULENCE MODELS; DC 9 AIRCRAFT; INTERNATIONAL SPACE STATION; ALGORITHMS; VIBRATION; MICROGRAVITY; COMBUSTION PHYSICS; ACCELERATION (PHYSICS); MATHEMATICAL MODELS; LARGE EDDY SIMULATION; DIFFUSION FLAMES; SPACECREWS
Year: 2003
Language: English
Book contributor: NASA
Collection: nasa_techdocs

Description

Studies were performed at INTA in Spain to determine water-film thickness on a stagnation-point probe inserted in a simulated cloud. The measurements were correlated with non-dimensional parameters describing the flow and the cloud conditions. Icing scaling tests in the NASA Glenn Icing Research Tunnel were then conducted using the Ruff scaling method with the scale velocity found by matching scale and reference values of either the INTA non-dimensional water-film thickness or a Weber number based on that film thickness. For comparison, tests were also performed using the constant drop-size Weber number and the average-velocity methods. The reference and scale models were both aluminum, 61-cm-span, NACA 0012 airfoil sections at 0 deg. AOA. The reference had a 53-cm-chord and the scale, 27 cm (1/2 size). Both models were mounted vertically in the center of the IRT test section. Tests covered a freezing fraction range of 0.28 to 1.0. Rime ice (n = 1.0) tests showed the consistency of the IRT calibration over a range of velocities. At a freezing fraction of 0.76, there was no significant difference in the scale ice shapes produced by the different methods. For freezing fractions of 0.40, 0.52 and 0.61, somewhat better agreement with the reference horn angles was typically achieved with the average-velocity and constant-film thickness methods than when either of the two Weber numbers was matched to the reference value. At a freezing fraction of 0.28, the four methods were judged equal in providing simulations of the reference shape.

Creative Commons license: Public Domain

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Identifier:	nasa_techdoc_20030063154
Document-source:	CASI
Documentid:	20030063154
Nasa-center:	Glenn Research Center
Online-source:	http://wayback.archive-it.org/1792/20100131174547/http://hdl.handle.net/2060/20030063154
Original-nasa-rights:	Unclassified; Copyright (Distribution as joint owner in the copyright) ; Unlimited; Publicly available; Final Report
Updated-added-to-ntrs:	2009-07-29
Licenseurl:	http://creativecommons.org/licenses/publicdomain/
Mediatype:	texts
Rights:	Public Domain
Identifier-access:	http://www.archive.org/details/nasa_techdoc_20030063154
Identifier-ark:	ark:/13960/t6k07zp0x
Ppi:	300
Ocr:	ABBYY FineReader 8.0